The phrase "whole fleet" refers to a group of vehicles or ships that belong to the same organization or owner. It means all of the vehicles or ships together. Full definition
If whole fleets of buses can be made almost 1/5 more fuel efficient with some simple training and maybe some onboard feedback devices, we're talking about vast quantities of fuel saved, which means less CO2, less smog - forming emissions, better air in cities, and an even bigger environmental advantage to transit over individual vehicles. (treehugger.com)
In 10 years time VW will offer whole fleet with E: s! (evo.co.uk)